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Periódicos Brasileiros em Medicina Veterinária e Zootecnia

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Monensin controlled-release capsules do not change performance and metabolic profile in unchallenged beef cattle

Faccio Demarco, ClaudiaSchwegler, ElizabethCassal Brauner, CassioFerri, EricaHalfen, JessicaFlorio, GabrielFlorio, DiegoEduardo da Silva Pedroso, CarlosMedeiros Gonçalves, FernandaNunes Corrêa, Marcio

Background: Some additives are able to improve animal performance in growing and finishing periods. Monensin was first used to control coccidiosis in poultry and was extended to other animals, like ruminants, to act also as a growth promoter and improve cattle performance. In this species, monensin improves the synthesis of propionic acid in the rumen and decreases methane synthesis and protein degradation, resulting in better performance in protein and energy metabolism. The objective of this study was to evaluate the use of monensin controlled-release capsules on animals grazing Lolium multiflorum intercropped with Trifolium repens on metabolic profile and performance.Materials, Methods & Results: Thirty Hereford cows were randomly distributed into two groups: control (CG) and monensin group (MG). Monensin was individually administered by controlled-release capsules placed in the rumen through oroesophageal pathway. All animals were identified through earring and kept under the same management condition, grazing on upland pasture mixture of Trifolium repens and Lolium multiflorum. Data from biochemical profile and performance were collected during 45 days. Blood samples started on the day of monensin controlled-release capsule placement (day 0) and continued in periods of 15, 30 and 45 days, after initial placement. Serum levels of albumin, glucose, urea, lactate dehydrog

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